Introduction to iOS
Swift, UIKit, SwiftUI — the Apple stack.
What iOS is, why it matters, and how to navigate this track.
iOS is a mobile technology. Swift, UIKit, SwiftUI — the Apple stack.
What is iOS?
iOS is a mobile technology used across modern software. Swift, UIKit, SwiftUI — the Apple stack.
This track introduces iOS from first principles, then goes deeper through the Deep, Reference, and Cheatsheet tabs.
Why learn iOS?
- iOS is widely used in industry and worth understanding well.
- Each topic pairs a clear explanation with hands-on examples.
- You can revisit any concept in the Reference tab or grab the Cheatsheet for quick recall.
Where it is used
- iOS & Android apps
- Cross-platform apps
- Mobile UIs
How this track works
Every topic here has four views, switchable with the tabs at the top of each page:
- Learn — the clear, practical walkthrough you are reading now.
- Deep — every detail: edge cases, the full API, and what is really happening.
- Reference — a scannable, no-fluff lookup for when you already know the shape.
- Cheatsheet — the one-page summary, printable, for quick recall.
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HTML Headings
h1 through h6 are the page’s table of contents. Use them for structure, never for size — that’s what CSS is for.
HTML Headings
h1–h6 are instances of HTMLHeadingElement. They take no special attributes — only the global set and ARIA — but there’s real depth in how they form the document outline and what you can do with them from JavaScript.
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